sh: Enable the mmu in start_secondary()
For the boot, enable_mmu() is called from setup_arch() but we don't call setup_arch() for any of the other cpus. So turn on the non-boot cpu's mmu inside of start_secondary(). I noticed this bug on an SMP board when trying to map I/O memory (smsc911x registers) into the kernel address space. Since the Address Translation bit in MMUCR wasn't set, accessing the virtual address where the smsc911x registers were supposedly mapped actually performed a physical address access. Signed-off-by: Matt Fleming <matt@console-pimps.org> Cc: stable@kernel.org Signed-off-by: Paul Mundt <lethal@linux-sh.org>
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@ -69,6 +69,7 @@ asmlinkage void __cpuinit start_secondary(void)
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unsigned int cpu;
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struct mm_struct *mm = &init_mm;
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enable_mmu();
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atomic_inc(&mm->mm_count);
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atomic_inc(&mm->mm_users);
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current->active_mm = mm;
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